be in place in the united states, may not be met in other countries. >> reporter: in the end, this latest plot was stopped not by technology, but by good spy work, with an apparent undercover operative inside al qaeda, raising some other questions about today's release of information by the white house. >> well, you have to wonder if this plot was foiled by someone on the inside, whether or not that means that source is blown, and therefore, they no longer have someone on the inside, and would not know about the next plot. >> u.s. officials say the head of operations for al qaeda in yemen was killed over the weekend by a u.s. drone strike. but tonight, the bomb maker, alasiri, is still at large and is believed to be training other bomb makers at how to make other bomb, all aimed at u.s. aircraft. >>> "good morning america" will have all the latest details on this story in the morning. just ahead, did you see "the avengers" this weekend? we'll bring you the big-brand cameos, you might have missed. with progressive mobile. great! tyler here will show you everything. check out our new mobile app.